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Additional resources for A Guide to SPSS/PC+

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If the questionnaire is not to be completed by a captive population such as a class of students it may be necessary to arrange for pre-addressed envelopes to be included with the questionnaire, or pick-up points to be specified, in order to encourage a high rate of return. Unless the population is captive a 100 per cent return rate cannot be expected, and it is possible that the respondents who fail to return their questionnaires will be different in some important way from those who did, thus limiting the extent to which we can generalize from the analyses obtained.

In most cases a printer will also be linked to the machine. Together these units make up the hardware of the computer system. Programs that run on the computer are referred to as software, SPSS/ PC+ being one example of a powerful program. Other programs include word processors and a number of programs which control the basic operation of the computer system (some of which are known collectively as the disk operating system, or DOS). 1 The computer keyboard - a guided tour Computer keyboards come in a variety of designs, and the way in which the computer responds when a particular key is pressed may be changed, in many different ways, by instructions given in programs.

E) 'Which ONE of the following games would you prefer to engage in': Hockey .. Tennis .. Football .. Shooting .. Skiing ... Golf ... Squash .. Chess .. In each of these examples only one answer is permitted- and thus each of the five questions (a) to (e) provides a single variable. Consider, however, a variation of example (e): (f) 'Which of the following games have you engaged in during the past FOUR WEEKS': Hockey .. Tennis .. Football .. Shooting .. Skiing ... Golf ... Squash .. Chess ..